Screw-threading device



(No-Model.)

J. MILLER.

SCREW THREADING DEVICE.

- Nn. 274,630; Pane-med Mar; 27, 188s.

N. PETERS. PhurLwmgmph-r, washingiwn. D. c.

UNITED STATES PATENT s Fries.

JOHN MILLER, OF UAMBRIDGEPORT, MASSACHUSETTS.

scREw-THREADING DEVICE.

SPECIFICATION forming part ot' Letters Patent No. 274,630, dated Marchi27, 1883.

Application filed November, 1885.. (No'model.) n

To all whom it mail; concern: v

Be it known that I, JOHN MILLER, a citizen of the United States, residing at Cambridgeport, in the county ot'Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Screw-Threading Devices; and I do hereby declare that the same are fully described in the following specifica- -tion and illustrated in the accompanyingdrawings.

This invention relatesto improvement in devices for threading pipes or cylindrical metal bars with a right or left handed screw-thread, as may be desired.

My present invention is an improvement on the patent granted to me July 5, 1881, No. 243,941, and it is carried out as follows, reference being had to the accompanying drawings, iu which- Figure l represents a plan view of my invention, and Fig. 2 a central longitudinal section of the same. Fig. 3 represents a crosssection on theline A B, shown in Fig. 1. l Similar letters refer to similar parts whereever they occur on the difterent parts of the drawings. v

In the drawings, a represents the stock, with its handle a', as usual. Said stock c is provided, as usual, with an opening in its larger end, into which is insertedA the tubular shank b of the pipe-cutter holding-frame c, which latter is provided on its under side with a ratchet-wheel, d, in the ordinary way.

c is a collar, secured to the tubular shank b by means of Vset-screw c, so as to retain the framevc in its position on the stock c, and at the same time to allow the latter to turn in either direction around the tubular shank b.

f is the ex ternally-screw-threaded feeder f1tting into an internal screw-thread in the tubular shank b, and provided with holding-screw f', as usual.

g is the double-acting pawl arranged to turn around the fulcrum pin or screw y', and provided on its side with the fla-t spring g". In combination with said reversible pawlg and its spring g, I use the improved keeper, as shown in the drawings, which keeper consists of a metal block, h, adapted to fit loosely in a recess, c", in the stock a, and provided with a pin or shank, h', that projects through a cor- To reverse the pawl g in its action on the ratch-l et-wheel d itis only necessary to depress the keeper-block h into the recess a against the inuence of the spring hf until one end of the pawl-spring g is released from its -notch r3, when the pawl g may be turned about halt' a revolution around its fulcrum-pin g' until the other end of the dat spring g comes opposite to the second slit or notch, fi, into which it is temporarily locked by the operator releasing the block h, which is then automatically forced upward by the action of the spring li, to hold the end 'ot the spring g until it is again desired to reverse the action of the tool.

By means of this `improvedkeeper I am enabled to use a very short and straight pawlspring, g", as shown in Fig. 1, and one that does not project beyond the side of the stock a. to interfere with the proper action of the tool.

This improved keeper is very easily operated, and when in use it will keep the pawlspring securely locked in one of its ends without liability of being accidentali unlocked when the tool is in use.

It is often desirable to increase the power and leverage of the screw-threading device, and for this reason I provide the stock c in its opposite end with a screw-threaded hub, c, into which is fitted the detachable handle k, which latter is used, in combination with the stock c and its ordinary handle c', for cutting heavy pipes. By means of the set-screw l,

which is screwed through the central part oi' the stock a, and having its inner end projeoting into a perforation, l', in the side of the tubular projection or shank b, as shown in Fig. 1, I 'am enabled to lock and secure together the stock a and hollow shank b, as may be desired, when using the tool independent ofthe ratchet IOC . tion of an ordinary solid tool.

and pawl,` in which condition it has the fune- By the removal ofthe additional handle 7c and unscrewing the set-screw l from the perforation l the tool is in' condition to be used as a ratchet-tool, as may be desired, when threading pipes in corners of rooms or in narrow or confined spaces.

.- What I wish to secure by Letters Patent,

and claim, is-

1. In combination, the stockv a, holder b c d, and pawl g, having at spring g", with the improved keeper, consisting of the block h, 

